1 PC Used Fanuc A16B-3200-0601 PCB Board In Good condition A16B32000601 A16B-32OO-O6O1

FANUC A16B-3200-0601 | R-30iA Main CPU PCB — Force Sensor Option, FANUC R-J3iC and R-30iA Robot Controllers, A05B-2500-H002, Japan Origin

Overview

The FANUC A16B-3200-0601 is the main CPU board for FANUC R-J3iC and R-30iA robot controllers ordered with the Force Sensor option.

It is closely related to the standard A16B-3200-0600 board — the two boards share the same physical dimensions, the same connector arrangement, and the same daughter card compatibility — but the -0601 includes additional interface circuitry that the -0600 does not have: the hardware needed to connect and communicate with FANUC's force/torque sensor units.

The Force Sensor option is what enables a FANUC robot to practice compliant motion — adjusting its trajectory in real time based on the forces it is sensing at its wrist or end-effector. Without force sensing, a robot follows its programmed path regardless of what forces develop at the tool: if the robot presses a part into a fixture with too much force, or encounters unexpected resistance during an insertion operation, it has no feedback mechanism to adjust.

With the Force Sensor option, the robot's control software continuously reads the force sensor's output, compares it against a programmed force setpoint or envelope, and adjusts axis velocities and positions to maintain the desired force or compliance profile.

The hardware integration of force sensing in the A16B-3200-0601 means that the force sensor interface is not a separate add-on board installed elsewhere in the controller — the interface is built into the main board itself.

This architectural choice reflects FANUC's typical design philosophy of integrating closely coupled functions at the main board level rather than requiring external interface boxes or additional rack space.

Key Specifications

Force Sensor Applications — Where the -0601 Enables the -0600 Cannot

The Force Sensor option opens up a category of robotic tasks that are very difficult to perform reliably with position-only control.

These tasks share a common characteristic: success depends not just on reaching the right position, but on applying the right force — and the right position and the right force may be different from cycle to cycle because of part tolerances, surface variation, or workpiece variability.

Robotic assembly with compliant insertion: Inserting a shaft into a bore, a connector into a socket, or a bearing into a housing all require the part to be aligned and then pressed in with controlled force. If the parts are not perfectly aligned when insertion begins, purely position-based control creates jamming forces — the robot pushes harder against the misalignment.

Compliant force control allows the robot to sense the misalignment force and adjust its trajectory to find the path of least resistance, successfully completing the insertion even with moderate part-to-part variation.

Surface following and grinding: Grinding, deburring, and polishing operations require consistent contact force against a surface. Position control cannot maintain consistent force against surface irregularities — the force varies with the surface.

Force control reads actual contact force and adjusts the robot's normal-to-surface position to maintain the set force, producing consistent material removal or surface finish regardless of surface variations.

Part inspection with contact probes: Measuring part dimensions with a contact probe requires applying a controlled seating force to ensure the probe is fully in contact without overloading the probe mechanism.

Force-controlled probing applies the programmed seating force and then reads the position — combining force and position sensing for accurate dimensional inspection.

The -0600 vs -0601 — What Changes Between Standard and Force Sensor Options

From the perspective of robot programming and motion control, robots equipped with the A16B-3200-0601 look identical to robots with the A16B-3200-0600 for all standard robot operations — point-to-point motion, arc motion, linear and circular interpolation, all operate through the same programming methods and interfaces.

The Force Sensor option adds an additional data source (the sensor reading) and additional programming constructs (force conditions, compliance frames, force-controlled move types) to the robot's programming environment.

From the hardware perspective, the A16B-3200-0601 has the force sensor connector and associated interface circuits that the -0600 lacks.

A robot controller built with the -0600 standard board cannot use a FANUC force sensor even if the sensor is physically mounted on the robot — the main board does not have the hardware to receive the sensor's data.

Conversely, a controller built with the -0601 Force Sensor board can use the force sensor option or can operate without a sensor connected (running as a standard robot in position control), making the -0601 a superset of the -0600's capabilities.

Replacing the A16B-3200-0601 — Critical Considerations

All data backup and restore considerations that apply to the standard A16B-3200-0600 board replacement apply equally here — robot programmes, mastering data, system parameters, tool coordinates, and user frames must all be backed up before board replacement and restored afterward.

The Force Sensor option adds an additional category of data to this backup requirement: the force sensor configuration, including sensor installation frame, sensor calibration data, and any force sensor parameters that may have been customised for the specific installation.

If the force sensor calibration data is lost and must be re-established, the sensor must be physically recalibrated with the robot in a known reference position — a procedure described in the Force Sensor installation and maintenance manual.

Ensuring this data is included in the controller's image backup before the board is removed saves significant re-commissioning time.

When ordering a replacement A16B-3200-0601, confirm the ordering specification A05B-2500-H002 — do not substitute the standard A16B-3200-0600 (A05B-2500-H001) in a Force Sensor application, as the standard board lacks the hardware required for force sensor operation.

FAQ

Q1: A robot with the Force Sensor option is showing "SRVO-062 BZAL" alarm after the main board was replaced. What is this?

SRVO-062 (BZAL) is a battery zero alarm — the pulse coder (encoder) backup battery for absolute position detection has failed or the data was lost during the board replacement.

When the main board is replaced, if the SRAM data was not retained through a proper backup and restore, or if the encoder battery was interrupted during the procedure, the pulse coder's absolute position counters may have reset. 

The robot requires re-mastering — positioning each joint to its reference mark and re-entering the zero count. Before re-mastering, confirm that the battery is newly replaced and in good condition, as the underlying cause (battery depletion) must be resolved before mastering will hold.

Q2: Can the force sensor calibration be performed in-house, or does it require a FANUC engineer?

FANUC force sensor calibration is a structured procedure described in the FANUC Force Sensor Operator's Manual.

In principle, it can be performed by a trained robot engineer with the appropriate tools and reference equipment — the calibration involves placing the sensor in a series of known orientations relative to gravity and having the robot software record the sensor readings at each position. However, the precision of the calibration affects the accuracy of force-controlled operations. 

For critical applications (tight force tolerances, precision insertion), having the calibration verified by a FANUC-certified engineer after in-house calibration is advisable.

Q3: The robot has the A16B-3200-0601 but the force sensor option software was not purchased. Can we add the software option later?

The A16B-3200-0601 provides the hardware prerequisite for force sensor operation.

The Force Sensor software option is an additional software licence that must be purchased from FANUC and registered on the controller.

If the hardware (main board and sensor) is installed but the software option is not registered, the force sensor functions will not be available in the robot's programming environment. 

The software option registration is performed through FANUC's option key management system.

Contact your FANUC representative to purchase and register the Force Sensor software option.

Q4: The force sensor readings drift over time during operation. Is this a main board issue?

Sensor reading drift during operation is typically a thermal effect — the force sensor's strain gauges respond to temperature as well as force, and as the sensor warms up during operation, its zero reference shifts.

This is addressed by performing a regular sensor payload calibration (which re-establishes the zero reference under the robot's actual payload weight at operating temperature) rather than by replacing the main board.

If the drift appears immediately after a cold start and reduces as the system warms up, thermal effects are the cause. 

If drift occurs randomly regardless of temperature, inspect the sensor cable connections and the sensor itself for physical damage.

Q5: When replacing the A16B-3200-0601 board, should the force sensor remain mounted on the robot?

Yes. The force sensor is a mechanical component mounted on the robot's wrist — it does not need to be removed for main board replacement in the controller cabinet.

The force sensor's signal cable (from the sensor, through the robot arm, to the controller cabinet connector) remains connected.

Focus the replacement procedure on the controller cabinet's main board. 

After board replacement and data restoration, verify force sensor connectivity by confirming the sensor readings respond correctly to a known load before returning the robot to production.